Frederick william schroeder



F. W. SCHROEDER.

INCANDESCENT GAS BURNER.

APPLICATION FILED MAY 4. 191a.

Patented Oct. 28, 1919.

.srnrns INGANDESCENT GAS-BURNER.

Specification of Letters Patent.

Patented Oct. 28, 1919.

7 Application filed Maya, 1918. Serial No. 232,515.

To all whom it may concern:

Be it known that I, FREDERICK WILLIAM SoI-InonDER, a subject of the King of Great Britain, residing in London, England, have invented certain new and useful Improve- I ments in Incandescent 'Gas -'Burners, of

which the following is a specification.

My invention relates to an inverted incandescent gas burner of the kind comprising a gas and air mixing device, a burner nozzle piece and an annular holder or ring for an inverted mantle, which holder is supported from the nozzle piece'by means of interengaging lugs on the nozzle and. holder. It consists in improvements which have for their object to produce greater brilliancy of light than has been possible heretofore by attaining a more perfect combustion'by retaining as much heat as possible around-the nozzle piece in order to heat thoroughly the mixture of air and gas passing from the gas and air mixing device, before it strikes the mantle. To these ends '1 construct the burner in such a manner that the mixing of the gas and air i eliected in stages, and I so arrangethe burner nozzle piece and mantle that the passage-way or'clearance, usually existing in known constructions of inverted incandescent gas burners between theside wall of "the nozzle piece and the inner peripheral wall of the mantle holder, is much restricted. for the purpose of retainingheat within the mantle and around the nozzle piece as long as possible soflthat the latter becomes heated, thereby causing a more perfect combustion than hitherto.

The improvements, which include improved forms of the mixing device, nozzle piece and mantle holder, will be described with reference to "the accompanying drawing in which Figure 1 is a sectional elevation of the improved'burner howing the improved mixing device and one form of the improved nozzle piecegand mantle holder; Fig. 2 is an elevation of the burner nozzle piece-and mantle holder shown in Fig. 1; Fig.3 1s a section SlIOWIIIga modified arrangement, where n the mantle holder 1s supported from the nozzle piece by means '"of a separate sleeve piece or yoke; Fig. 4 is a plan view of the nozzle piece shown in Fig. 8 ;'andjFig. 5 is a plan of the improved mantle holder. In the several figures the same parts are distinguished by the same letters.

Fig; J. shows the arrangement for tallestingthe mixing of the gas and air in. stages. As there shown a portion of the air necessar i for perfect combustion mixes with the gas as the latter enters a Bunsen-like tube a, located in a mixing chamber Z), from the gas supply pipe 0. A furtherquantity. of air is allowed to mix with the first mixture as the latter issues from the mouth of the Bunsen tubea and a still further quantity of air is added to the said last mixture as this mixture issues at the mouth of the mixing chamber 5 and enters a mixing tube i. The final mixture of gas and air passes along the tube 2', which is appropriatelybent, to the nozzle piece j.

The terminal portion ofthe mixing chamher in proximity to the Bunsen tube a is inclosed in a chamber f formed by a casing e which at. its upper end is attached. to the upper-end of the mixing chamber Z) and at its lower end is 'formed with an inwardly projecting flange 6 so as to leave a restricted annular passage 9, between it and the chamber *6, through which passage air is able to enter chamber f. Air thus admitted to chamber 7 enters chamber Z) through openingb in its side wall. Of the air entering mixing chamber 6, which in its upper portion is contracted to form a preliminary mixing tube 2'). Issuingat the mouth b of the preliminary mixing tube 6 the mixture enters the mixing tube or arm 2'. The remaining portion of the requisite air to be mixed with the gas can be added to the mixture as itthus enters tube 71. The remaining portion of air may be conveniently admitted by means of passages it formed by indenting or oorrugating the wall 5 of the reduced upper portion 1)" of the 'mixing chamber 6.

The burner nozzle piece j, which may be of porcelain or any other appropriate substance, is,as in some known burners, of a shape that is conical at its lower or exit end and cylindrical at its other or admission end. It is screwed or otherwise suitably attached to the. armil', which in practice would be so arranged that the nozzle piece 9', or a globe encircling it, would be in close proximity to the wall 6 of chamber 7 in order to heat that ehamber'and the air within it. The

nozzle piece is provided according to this invontion with a projecting flange y" which serves to support the mantle holder or ring 70. In the arrangement shown in Figs. 1 and 2, a number of L shape lugs j depend from the flange j being integrally formed therewith. The improved mantle holder or ring is formed with outside lugs only. These lugs which correspond in number with lugs 7' extend upwardly and outwardly, so that when the holder is passed or threaded over the outlet or lower end of the nozzle piece j, the lugs 70 can, by turning the holder, be made to engage, in bayonet-like fashion, with the lugs 7' The bore of the mantle holder 70 is such that its internal periphery fits snugly around the lower or cylindrical portion of the nozzle piece, but its internal peripheral wall is provided with a series of shallow grooves or corrugations, such as 70 Fig. 5, for the passage of the heated products of combustion which escape slowly through the grooves 70 from the space within the mantle Z thereby heating the nozzle piece which therefore acts also as a chamber for heating the mixture of gas and air passing therethrough from the tube 2'.

In the arrangement shown in Figs. 3, 4E and 5, the lugs 70' on the mantle holder engage with lugs m formed on a separate sleeve piece m, which may be formed of metal or other suitable substance, and. is adapted to fit upon the flanged portion j of the nozzle piece j. Suitable means are provided for preventing th sleeve we turning around when the mantle holderon being slipped over the end of the nozzle piece is turned in a manner to cause' lugs 70 to engage with lugs m on the sleeve piece. I!" or instance the nozzle piece j may be provided with slots j into which the depending lugs m on the sleeve can be inserted or placed to prevent rotation of the sleeve.

Since the improved annular mantle ring is devoid of internal projections or lugs, it is possible to use such mantle ring also with upright mantle burners.

Having thus fully described the nature of my said invention and the best means I know of carrying the same into practical effect, I claim 1. An inverted incandescent gas burner comprising, in combination, a burner nozzle and a gas air mlxmg devlce arranged to admit air in three stages, said device comprising, in combination, a gas supply nozzle, a Bunsen tube encircling the outlet end of said nozzle and having apertures in its side wall,

'an open-ended tubular casing having lat end fixed to the first casing and the other end provided with an inwardly projecting flange encircling the fixed end of the first casing and forming therewith a restricted annular passage open to the atmosphere, whereby air entering the passage passes through the said apertures into the first said oasing,a portion of said air flowing through the said openings and mixing with gas issuing from the outlet of the gas supply nozzle,

the ren'iaining portion of air commingling with the gas and air issuing from the outlet of the Bunsen tube, and a mixing tube havingone end connected with the Bunsen burner nozzle and the other end overlapping the second end of the first said tubular casing and forming therewith channels open to the atmosphere, whereby air entering through the channels unites with the mixture of. air and gas issuing from the outlet of the last said casing.

2. An inverted incandescent gas burner comprising in combination gas andair mixing device arranged to admit air to the mixing device in a plurality of stages, said device comprising in combination a gas supply nozzle, a Bunsen-tube encircling said nozzle and having air inlet apertures in its side wall, an open-ended tubular casing having laterally disposed air inlet openings, said casing surrounding the Bunsen tube and having one end fixed thereto, a second openended casing, one end thereof fixed to the first casing, and the second end provided with an inwardly proj ectinjg flange encircling the fixed end of the first casing and forming therewith a restricted annular air inlet passage, and a mixing tube having one end overlapping the secondend of the tubular casing andv forming therewith passages for admitting air to said tube and means for heating the gaseous mixture before it is ignited or burnt, said heating means consisting of a downwardly directed burner nozzle piece supported from the second end of the mixing tube and having a cylindrical body part, a number of downwardly extending L-shaped lugs carried by the nozzle piece, and an annular mantle holder encircling the said body part of the nozzle piece and having a number of upwardly and outwardly extending lugs detachably and cooperatively ngaging the said downwardly extending lugs, the inner peripheral wall of the holder being formed with a plurality of shallow grooves for the passage of heated products of combustion.

3. An inverted incandescent gas burner comprising in combination a gas and air mixing device arranged to admit air to the mixing device in a plurality of stages, said device comprising in combination a gas supply nozzle, a Bunsen-tube encircling said nozzle and having air inlet a ertures in its side wall, an 'open ended tubu areasing hav ing laterally disposed air inlet openings, said casing surrounding the Bunsen tube and having one end fixed thereto, .a second open ended casing, one end thereof fixed to the first casing, and the second end provided with an inwardly projecting flange encircling the fixed end of the first casing and forming therewith a restricted annular air inlet passage, and a. mixing tube having one end overlapping the second nd of the tubular casing and forming therewith passages for admitting air to said tube and means for heating the gaseous mixture before it is ignited or burnt, said heating means consisting of a downwardly-directed burner nozzle piece supported from the second end of the mixing tube and having a cylindrical body part and a number of integrally formed downwardly extending L shaped lugs, and an annular mantle holder encircling the said body part of the nozzle piece and having a number of upwardly and outwardly extending lugs detachably and cooperatively engaging the said downwardly extending lugs, the inner peripheral wall of the holder being formed with a plurality of shallow grooves for the passage of heated products of combustion.

In testimony whereof I have signed my name to this specification 1n thepresence 01' two subscribing witnesses.

FREDERICK WILLIAM SCHROEDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

